Warren 19a99cc676 Complete Phase 15: Window Control + sshbuf zero-copy + SCP support ...

- Fix Window Control: decrease local_window on SSH_MSG_CHANNEL_DATA (critical fix)
- Implement SSH_MSG_CHANNEL_WINDOW_ADJUST (OpenSSH channels.c style)
- Add sshbuf.rs: zero-copy buffer management (339 lines, OpenSSH sshbuf.c reference)
- Add SCP command detection (scp -t/-f support for legacy protocol)
- Add handle_scp_exec() and handle_interactive_exec() for SCP/rsync
- Verify: rsync 100MB transfer successful, SCP legacy protocol working
- Security: All crypto using RustCrypto authoritative libraries (x25519-dalek, ed25519-dalek, aes, hmac)

2026-06-17 13:59:28 +08:00

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